package com.bill.concurrency.example.count;

import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

/**
 * @author bill
 * 模拟5000个请求，并发200个用户，访问。
 */
@Slf4j
public class CountExample1 {
    public static int clientTotal=5000;
    public static int threadTotal=200;
    public static int count=0;

    public static void main(String[] args) {
        ExecutorService executorService=Executors.newCachedThreadPool();
        final Semaphore semaphore=new Semaphore(threadTotal);
        final CountDownLatch countDownLatch=new CountDownLatch(clientTotal);
        executorService.execute(()->{
            for(int i=0;i<clientTotal;i++){
                try {
                    semaphore.acquire();
                    add();
                    semaphore.release();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                countDownLatch.countDown();
            }
        });

        try {
            countDownLatch.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        executorService.shutdown();

        log.info("count={}",count);
    }

    private static void add(){
        count++;
    }
}
